Apparently you are talking about work shifts, but we are guessing. What kind of rotation are you talking about? What country and what industry?
midday
midnight
Midday is 12 noon or 12 midday. It is not 12 p.m. as p.m. means 'after midday'; nor is it 12 a.m. as a.m. means 'before midday. Logically, midday cannot be before or after midday. Similarly, midnight is 12 midnight.
mid, as in MIDday and MIDnight
The opposite of midnight is midday, or noon(local).
Today .
midday
no midday
midday or midnight
AM stands for Ante Meridian - meaning before noon and PM is Post Meridian - after noon.
Synonym: midnight can be synonymous with "midnight hour" or "bewitching hour." Antonym: The antonym of midnight would be noon or midday.
miday is 12pm midnight is 12am.